In the masters-doctoral-thesis template the language is chosen when the document class is called in the main. This is applied to the whole thesis.However, I would like to change the language just for one specific chapter. Is this possible?

Thanks Johannes_B, Thanks for the contribution, I have applied it with a good result

\newcaptionname{spanish}{\acknowledgementname}{Agradecimientos}\newcaptionname{spanish}{\byname}{por}\newcaptionname{spanish}{\authorshipname}{Declaraci\'on de autor\'ia}\newcaptionname{spanish}{\constantsname}{Constantes f\'isicas}\newcaptionname{spanish}{\symbolsname}{Lista de s\'imbolos}